These hex keys are precision formed to exact dimensional tolerances for a precise fit. The heat-treated alloy steel helps to provide high strength and resistance to rotational distortion. Hex Key, Ball End Hex Key, Shape L, Measurement Type Metric, Tip Size 5mm, Arm Length 4-37/64 In., Handle Length 1 In., Blade Material Alloy Steel, Finish Black Oxide, Standard Tool (Accessory Needed for Tethering), Nonsparking No, Uninsulated, Handle Type Plain, Handle Color Gray, Handle Material Steel, Working Angle 25 Degrees , Meets/Exceeds ANSI, Package Quantity 10